First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 6
... average of crops can be doubled , and that at a cost per acre scarcely more than is now required for the half- crop . To accomplish this necessitates a broader knowl- edge of the food requirements of plants than is pos- sessed by the ...
... average of crops can be doubled , and that at a cost per acre scarcely more than is now required for the half- crop . To accomplish this necessitates a broader knowl- edge of the food requirements of plants than is pos- sessed by the ...
Página 7
... average for the last eight years being 111⁄2 bushels . In these cases the soil seems capable of keeping up the yield indefinitely , as the average for the last twenty years is practically the same as the average given above for the last ...
... average for the last eight years being 111⁄2 bushels . In these cases the soil seems capable of keeping up the yield indefinitely , as the average for the last twenty years is practically the same as the average given above for the last ...
Página 14
... AVERAGE AMOUNT OF WATER USED TO PRODUCE ONE TON OF DRY MATTER Crop grown Barley . Oats Corn . Clover Peas Potatoes Tons of water for one ton dry matter • 461.1 503.9 270.9 576.6 477.2 385.1 From this and other data he calculated the ...
... AVERAGE AMOUNT OF WATER USED TO PRODUCE ONE TON OF DRY MATTER Crop grown Barley . Oats Corn . Clover Peas Potatoes Tons of water for one ton dry matter • 461.1 503.9 270.9 576.6 477.2 385.1 From this and other data he calculated the ...
Página 34
... of the essential element present in least proportion , compared with the requirements of the crop . In other words , if a field of corn can obtain potash sufficient for only half an average crop , no. 34 FIRST PRINCIPLES OF SOIL FERTILITY.
... of the essential element present in least proportion , compared with the requirements of the crop . In other words , if a field of corn can obtain potash sufficient for only half an average crop , no. 34 FIRST PRINCIPLES OF SOIL FERTILITY.
Página 35
Alfred Vivian. potash sufficient for only half an average crop , no more than this can be produced no matter how much of the other forms of plant food is present . How the Mineral Matter Enters the Plant . - It seems evident that the ...
Alfred Vivian. potash sufficient for only half an average crop , no more than this can be produced no matter how much of the other forms of plant food is present . How the Mineral Matter Enters the Plant . - It seems evident that the ...
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Términos y frases comunes
acid and potash acre agricultural ammonia amount of nitrogen amount of plant animals applied average bacteria barn barnyard manure bedding carbonic acid clay clover commercial fertilizers complete fertilizers composition compounds condition corn crop decay deep stall denitrification drainage dry matter elements of plant Experiment Station fact farm farmer feeding fertilizing constituents fertilizing materials fertilizing value field grain green manuring ground grown hot fermentation humus important inches increase ingredients kainite land leaching legumes leguminous lime liquid excrement loss of nitrogen lysimeters manure produced materials ments method mineral matter mixed moisture necessary nitrate of soda nitrification nitrifying bacteria nitro nitrogen nure obtained organic matter oxygen phoric acid phos phosphate phosphoric acid plant food plant growth plots plowed pounds practically present rains ration removed rock roots rotation shown soil soil contains soluble substances sufficient sulphate superphosphate supply surface tillage tion urine wheat yield